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Overview of I/O Memory Area
Section 4-1
Timer PVs
The PVs are read and written as words (16 bits). The PVs count up or down
as the timer operates.
Counter Area (C)
There are two parts to the Counter Area: the Counter Completion Flags and
the Counter Present Values (PVs). Up to 4,096 counters with counter num-
bers C0 to C4095 can be used.
Counter Completion Flags
These flags are read as individual bits. A Completion Flag is turned ON by the
system when the corresponding counter counts out (i.e., when the set value is
reached).
Counter PVs
The PVs are read and written as words (16 bits). The PVs count up or down
as the counter operates.
Condition Flags
These flags include the Arithmetic Flags, such as the Error Flag and Equals
Flag, which indicate the results of instruction execution as well as the Always
ON and Always OFF Flags. The Condition Flags are specified with symbols
rather than addresses.
Clock Pulses
The Clock Pulses are turned ON and OFF by the CPU Unit’s internal timer.
These bits are specified with symbols rather than addresses.
Task Flag Area (TK)
A Task Flag will be ON when the corresponding cyclic task is in executable
(RUN) status and OFF when the cyclic task hasn’t been executed (INI) or is in
standby (WAIT) status.
Index Registers (IR)
Index registers (IR0 to IR15) are used to store PLC memory addresses (i.e.,
absolute memory addresses in RAM) to indirectly address words in I/O mem-
ory. The Index Registers can be used separately in each task or they can be
shared by all tasks.
Data Registers (DR)
Data registers (DR0 to DR15) are used together with Index Registers. When a
Data Register is input just before an Index Register, the content of the Data
Register is added to the PLC memory address in the Index Register to offset
that address. The Data Registers can be used separately in each task or they
can be shared by all tasks.
Содержание CP1H-CPU - 05-2006
Страница 1: ...OPERATION MANUAL CP1H CPU Unit SYSMAC CP Series CP1H X40D CP1H XA40D CP1H Y20DT D Cat No W450 E1 02...
Страница 2: ...CP1H X40D CP1H XA40D CP1H Y20DT D CP1H CPU Unit Operation Manual Revised May 2006...
Страница 3: ...iv...
Страница 11: ...xii TABLE OF CONTENTS...
Страница 15: ...xvi...
Страница 19: ...xx...
Страница 31: ...xxxii Conformance to EC Directives 6...
Страница 71: ...40 Function Blocks Section 1 5...
Страница 133: ...102 Computing the Cycle Time Section 2 7...
Страница 169: ...138 CPM1A Expansion I O Unit Wiring Section 3 6...
Страница 411: ...380 Clock Section 6 8...
Страница 519: ...488 Replacing User serviceable Parts Section 10 2...
Страница 527: ...496 Standard Models Appendix A...
Страница 535: ...504 Dimensions Diagrams Appendix B...
Страница 628: ...597 Connections to Serial Communications Option Boards Appendix F Connecting to Unit...
Страница 629: ...598 Connections to Serial Communications Option Boards Appendix F...
Страница 659: ...628 PLC Setup Appendix G...
Страница 665: ...634 Index work words 159 write protection 370...
Страница 667: ...636 Revision History...